/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.xml.xpath;

import java.util.Map;
import javax.xml.namespace.QName;
import javax.xml.xpath.XPathVariableResolver;

/** */
class ThreadLocalXPathVariableResolver implements XPathVariableResolver {
    private final ThreadLocal<Map<String, ?>> localVariables = new ThreadLocal<Map<String, ?>>();

    public void setVariables(Map<String, ?> variables) {
        this.localVariables.set(variables);
    }

    public void clearVariables() {
        this.localVariables.set(null);
    }

    /* (non-Javadoc)
     * @see javax.xml.xpath.XPathVariableResolver#resolveVariable(javax.xml.namespace.String)
     */
    @Override
    public Object resolveVariable(QName variableName) {
        final Map<String, ?> variables = this.localVariables.get();
        if (variables == null) {
            return null;
        }

        final String localPart = variableName.getLocalPart();
        return variables.get(localPart);
    }
}
